Certified Rhythm Analysis Technician (CRAT) Practice Exam

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What is the effect of increased vagal tone on heart rate?

Increases heart rate

Decreases heart rate

Increased vagal tone refers to heightened activity of the vagus nerve, which is part of the parasympathetic nervous system. The primary role of the vagus nerve in relation to heart function is to promote a decrease in heart rate. When vagal tone is elevated, it leads to increased release of acetylcholine at the heart's sinoatrial (SA) node, which slows down the firing rate of these pacemaker cells. As a result, the overall heart rate decreases.

This relationship is significant in numerous physiological contexts, such as during rest or sleep when the body is in a relaxed state, and higher vagal tone is synonymous with a more dominant parasympathetic nervous response, promoting a lower heart rate. This negative chronotropic effect is essential for maintaining cardiac function and adapting to various activities and stressors.

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No effect on heart rate

Causes irregular heart rhythms

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